Commit 3920742b authored by Jordan Niethe's avatar Jordan Niethe Committed by Michael Ellerman
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powerpc sstep: Add support for prefixed fixed-point arithmetic 



This adds emulation support for the following prefixed Fixed-Point
Arithmetic instructions:
  * Prefixed Add Immediate (paddi)

Signed-off-by: default avatarJordan Niethe <jniethe5@gmail.com>
Reviewed-by: default avatarBalamuruhan S <bala24@linux.ibm.com>
[mpe: Squash in get_op() usage]
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200506034050.24806-31-jniethe5@gmail.com
parent 50b80a12

arch/powerpc/lib/sstep.c

+20 −0
Original line number Diff line number Diff line
@@ -1338,6 +1338,26 @@ int analyse_instr(struct instruction_op *op, const struct pt_regs *regs, 


	switch (opcode) {

#ifdef __powerpc64__

	case 1:

		prefix_r = word & (1ul << 20);

		ra = (suffix >> 16) & 0x1f;

		rd = (suffix >> 21) & 0x1f;

		op->reg = rd;

		op->val = regs->gpr[rd];

		suffixopcode = get_op(suffix);

		prefixtype = (word >> 24) & 0x3;

		switch (prefixtype) {

		case 2:

			if (prefix_r && ra)

				return 0;

			switch (suffixopcode) {

			case 14:	/* paddi */

				op->type = COMPUTE | PREFIXED;

				op->val = mlsd_8lsd_ea(word, suffix, regs);

				goto compute_done;

			}

		}

		break;

	case 2:		/* tdi */

		if (rd & trap_compare(regs->gpr[ra], (short) word))

			goto trap;